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Assuming the mechanism turns freely, the easiest thing to check is the orientation of the drum/brusholders.

If you take out those little drums, and work the reversing lever, you will see a small metal finger come down into the drum chamber. The drum with teeth sticking out radially goes on the side with the finger. The second drum, with recessed teeth goes on the other side. The teeth engage eachother. When they are engaged, where the teeth mesh, a copper segment on one drum should match up to a plastic segment on the other.

Look at the contact fingers. each finger assembly should be in contact with a copper segement on a different drum, and should only be contacting one drum. The contact should rest on a plastic segment on the alternate one.

 

Sometimes the drums get stuck between operating positions. Working the reversing control lever a couple of times usually clears this problem up. If this problem keeps occuring, then there may be a burr on one of the drums, or the mechanism needs attention.

I repaired an armature that was rewound, but then the windings were wired to the wrong commutator segments.

 

Fortunately I had an original armature for comparison. Moving the wiring to the proper commutator segment and rotating the loose commutator to the proper degree or angle produced a motor that ran exceptionally well and made for a happy customer.

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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